ALS train error

[Saurabh Agrawal <sa...@markit.com>]

Hi,

I am getting the following error

val model = ALS.train(ratings, rank, numIterations, 0.01)

org.apache.spark.SparkException: Job aborted due to stage failure: Task 1 in stage 103.0 failed 1 times, most recent failure: Lost task 1.0 in stage 103.0 (TID 3, localhost): scala.MatchError: [Ljava.lang.String;@4837e797 (of class [Ljava.lang.String;)
        $iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:16)
        $iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:16)
        scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
        scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
        scala.collection.Iterator$class.foreach(Iterator.scala:727)
        scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
        org.apache.spark.shuffle.hash.HashShuffleWriter.write(HashShuffleWriter.scala:65)
        org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68)
        org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
        org.apache.spark.scheduler.Task.run(Task.scala:54)
        org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:177)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        java.lang.Thread.run(Thread.java:745)
Driver stacktrace:
                at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1185)
                at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1174)
                at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1173)
                at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
                at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
                at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1173)
                at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:688)
                at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:688)
                at scala.Option.foreach(Option.scala:236)
                at org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:688)
                at org.apache.spark.scheduler.DAGSchedulerEventProcessActor$$anonfun$receive$2.applyOrElse(DAGScheduler.scala:1391)
                at akka.actor.ActorCell.receiveMessage(ActorCell.scala:498)
                at akka.actor.ActorCell.invoke(ActorCell.scala:456)
                at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:237)
                at akka.dispatch.Mailbox.run(Mailbox.scala:219)
                at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
                at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
                at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
                at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
                at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

Thanks!!

Regards,
Saurabh Agrawal


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